This crate has fit our 51 lbs. boxer very well. It has more than enough room, and is very easy to collapse. The crate fits easily in the back of the smallest SUVs, or even a hatchback. It is a bit heavy though, and moving it up and down stairs can be a pain. If you have the need for an easily movable dog crate, I cannot recommend this enough. But, if you just need a crate, and don't plan to take it on trips, there may be better options for you.
UPDATE: It's now 4 years later. We bought a second crate almost 3 years ago when we adopted a second boxer, this time an 85 pound boy named Duncan. Today both crates are in great shape. I will say, Duncan was an escape artist, and managed to wedge himself between the bars under the door and get out without unlocking the door. Managed to pop a couple of 'welded' support at the base in doing so. I can't image how difficult and freaky that was for him, but he did it. Imagine my surprise when I got home. A couple of steel carabiners later, and the crate was re-secured. We still have both crates even though we don't lock either dog in them any more. Both boxers will still wander over to them and take a nap in their respective crate. It's also where they "go to bed" before we give them treats and high tail it out the door when we leave the house.
I can't recommend these enough. I found them very sturdy, easy to move for a large crate, and very durable.
One last piece. Both crates are the 'large' size. Just realized I missed that in my original review.